1 /*
   2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test TestG1TraceEagerReclaimHumongousObjects
  26  * @bug 8058801 8048179
  27  * @summary Ensure that the output for a G1TraceEagerReclaimHumongousObjects
  28  * includes the expected necessary messages.
  29  * @key gc
  30  * @requires vm.gc.G1
  31  * @library /test/lib
  32  * @modules java.base/jdk.internal.misc
  33  *          java.management
  34  */
  35 
  36 import jdk.test.lib.process.OutputAnalyzer;
  37 import jdk.test.lib.process.ProcessTools;
  38 import java.util.LinkedList;
  39 
  40 public class TestG1TraceEagerReclaimHumongousObjects {
  41   public static void main(String[] args) throws Exception {
  42     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
  43                                                "-Xms128M",
  44                                                "-Xmx128M",
  45                                                "-Xmn16M",
  46                                                "-XX:G1HeapRegionSize=1M",
  47                                                "-Xlog:gc+phases=trace,gc+humongous=trace",
  48                                                "-XX:+UnlockExperimentalVMOptions",
  49                                                GCWithHumongousObjectTest.class.getName());
  50 
  51     OutputAnalyzer output = new OutputAnalyzer(pb.start());
  52 
  53     // As G1ReclaimDeadHumongousObjectsAtYoungGC is set(default), below logs should be displayed.
  54     output.shouldContain("Humongous Reclaim");
  55     output.shouldContain("Humongous Total");
  56     output.shouldContain("Humongous Candidate");
  57     output.shouldContain("Humongous Reclaimed");
  58 
  59     // As G1TraceReclaimDeadHumongousObjectsAtYoungGC is set and GCWithHumongousObjectTest has humongous objects,
  60     // these logs should be displayed.
  61     output.shouldContain("Live humongous");
  62     output.shouldContain("Dead humongous region");
  63     output.shouldHaveExitValue(0);
  64   }
  65 
  66   static class GCWithHumongousObjectTest {
  67 
  68     public static final int M = 1024*1024;
  69     public static LinkedList<Object> garbageList = new LinkedList<Object>();
  70     // A large object referenced by a static.
  71     static int[] filler = new int[10 * M];
  72 
  73     public static void genGarbage() {
  74       for (int i = 0; i < 32*1024; i++) {
  75         garbageList.add(new int[100]);
  76       }
  77       garbageList.clear();
  78     }
  79 
  80     public static void main(String[] args) {
  81 
  82       int[] large = new int[M];
  83       Object ref = large;
  84 
  85       System.out.println("Creating garbage");
  86       for (int i = 0; i < 100; i++) {
  87         // A large object that will be reclaimed eagerly.
  88         large = new int[6*M];
  89         genGarbage();
  90         // Make sure that the compiler cannot completely remove
  91         // the allocation of the large object until here.
  92         System.out.println(large);
  93       }
  94 
  95       // Keep the reference to the first object alive.
  96       System.out.println(ref);
  97       System.out.println("Done");
  98     }
  99   }
 100 }